We test and review Radeon R9-290X Crossfire vs GeForce GTX 780 SLI, next to our default FPS benchmarks we do Ultra HD and FCAT Frametime measurements as well. The boards used are reference. Over the n...

AMD On The Temperatures:
I wanted to highlight our new PowerTune mechanism, as some of you have expressed concerns around acoustics and temperature. As noted in our explanation of the new mechanisms included in PowerTune on the 290 Series, we have designed the 290 Series to operate at a steady state of 95C. By running at 95C, we are both maximizing the performance and minimizing the acoustics of the product. We do this by increasing clocks/voltages and/or reducing the fan speed until the GPU runs at the temperature target. By having the GPU target at lower temperature, you sacrifice either performance or acoustics.
Some of you have expressed concern over the GPU running at 95C. Be assured, that 95C is a perfectly safe temperature at which the GPU can operate for its entire life. There is no technical reason to reduce the target temperature below 95C. However, like all aspects of PowerTune, this is completely within the control of the end user. If you would rather have you GPU operate at a lower temperature, such as 85C or 73C, we strongly encourage you to customize it to your preference and write about it in your review. This is, after all, the reason that we design products with this level of flexibility.

It will still be 95 max even in multi gpu setups since the card automatically downclocks to keep the 95 threshold, of course this is in stock settings, there will probably be ways to unlock that protection.